CVE-2018-6553

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

The CUPS AppArmor profile incorrectly confined the dnssd backend due to use of hard links. A local attacker could possibly use this issue to escape confinement. This flaw affects versions prior to 2.2.7-1ubuntu2.1 in Ubuntu 18.04 LTS, prior to 2.2.4-7ubuntu3.1 in Ubuntu 17.10, prior to 2.1.3-4ubuntu0.5 in Ubuntu 16.04 LTS, and prior to 1.7.2-0ubuntu1.10 in Ubuntu 14.04 LTS.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

August 10, 2018

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Aug 12, 2026
Patch available.
generic

[SECURITY] [DSA 4243-1] cups security update

https://www.debian.org/security/2018/dsa-4243
generic

USN-3713-1: CUPS vulnerabilities | Ubuntu security notices | Ubuntu

https://usn.ubuntu.com/usn/usn-3713-1
generic

CUPS: Multiple vulnerabilities (GLSA 201908-08) — Gentoo security

https://security.gentoo.org/glsa/201908-08
generic Patch Available

[SECURITY] [DLA 1426-1] cups security update

https://lists.debian.org/debian-lts-announce/2018/07/msg00014.html

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcupsppdc1-dev (2.1.3-4ubuntu0.5) @ xenial2026-05-28ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
cups—2.2.8-5—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
cups—2.2.8-5—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
cups—2.2.8-5—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
cups—2.2.8-5—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
cups1.7.5-11, 1.7.5-11+deb8u1, 1.7.5-11+deb8u2, 1.7.5-11+deb8u31.7.5-11+deb8u4—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
cups2.2.1-8, 2.2.1-8+deb9u1, 2.2.1-8+deb9u1~bpo8+12.2.1-8+deb9u2—

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 125 total refreshes for this CVE.

  1. 2026-08-20 22:51 UTCEPSS rescore
  2. 2026-08-19 17:00 UTCEPSS rescore
  3. 2026-08-18 13:44 UTCEPSS rescore
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  6. 2026-07-23 01:37 UTCEG score recompute
  7. 2026-07-22 22:17 UTCEG score recompute
  8. 2026-07-22 14:05 UTCEPSS rescore
  9. 2026-07-21 15:22 UTCEPSS rescore
  10. 2026-07-21 07:17 UTCOSV refresh
  11. 2026-07-20 17:04 UTCEPSS rescore
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  24. 2026-07-09 19:06 UTCEPSS rescore
  25. 2026-07-08 15:11 UTCEPSS rescore
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  27. 2026-07-07 13:42 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2018-6553?
CVE-2018-6553 is a high vulnerability published on August 10, 2018. The CUPS AppArmor profile incorrectly confined the dnssd backend due to use of hard links. A local attacker could possibly use this issue to escape confinement. This flaw affects versions prior to 2.2.7-1ubuntu2.1 in Ubuntu 18.04 LTS, prior to 2.2.4-7ubuntu3.1 in Ubuntu 17.10, prior to…
When was CVE-2018-6553 disclosed?
CVE-2018-6553 was first published in the National Vulnerability Database on August 10, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-6553 actively exploited?
CVE-2018-6553 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.1% of all scored CVEs.
What is the CVSS score of CVE-2018-6553?
CVE-2018-6553 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2018-6553?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-6553, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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